Old thread but figured I'd chime in.
I'm not running 37" tires. I have 35x12.5x17 and don't need spacers. There are several JK's running RM's with 37" and don't need spacers, running the RK 2.5" lift.
Sold.
Dana 30 w/Artec truss, Eaton eLocker, Synergy ball joints, c-gussets, Solid diff cover, 4.10 gears, knuckles, hubs and shafts. Rear 4.10 gears included.
Brakes are not included. Everything done within the last four months. $1,200.